EP1575790A1 - Method for indirectly identifying the loss of pressure on a motor vehicle wheel - Google Patents

Method for indirectly identifying the loss of pressure on a motor vehicle wheel

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Publication number
EP1575790A1
EP1575790A1 EP03789198A EP03789198A EP1575790A1 EP 1575790 A1 EP1575790 A1 EP 1575790A1 EP 03789198 A EP03789198 A EP 03789198A EP 03789198 A EP03789198 A EP 03789198A EP 1575790 A1 EP1575790 A1 EP 1575790A1
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EP
European Patent Office
Prior art keywords
wheel
acceleration
acc
wheel acceleration
vehicle
Prior art date
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Granted
Application number
EP03789198A
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German (de)
French (fr)
Other versions
EP1575790B1 (en
Inventor
Martin Griesser
Andreas Köbe
Frank Edling
Vladimir Koukes
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Teves AG and Co OHG
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Continental Teves AG and Co OHG
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Publication of EP1575790A1 publication Critical patent/EP1575790A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00—Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps or of tanks; Tyre cooling arrangements
    • B60C23/06—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle
    • B60C23/061—Signalling devices actuated by deformation of the tyre, e.g. tyre mounted deformation sensors or indirect determination of tyre deformation based on wheel speed, wheel-centre to ground distance or inclination of wheel axle by monitoring wheel speed

Definitions

  • the present invention relates to a method for indirect pressure loss detection on a motor vehicle wheel, and a computer program product according to claim 10.
  • DE 100 44 114 AI describes a further method and a device for detecting a loss of pressure in tires in motor vehicles with a plausibility check.
  • the reference values determined in this document for the detection of a pressure loss are checked by the plausibility check in order to avoid or minimize false warnings.
  • WO 2000006433 AI describes a method for rough road detection which is used for vehicle speed control.
  • a disadvantage of these known indirect pressure loss detection methods is that these methods always build on deviations of the individual wheels from one another, so that a pressure loss on more than one tire is not always recognizable. In particular, the detection of pressure losses on several or all tires is not always possible.
  • the wheel acceleration is preferably observed for all four wheels within a predetermined time and deviations in the wheel acceleration are evaluated.
  • the wheel acceleration is preferably only evaluated when certain driving maneuvers or driving conditions are present.
  • Straight-ahead driving is regarded as a particularly preferred driving state.
  • a straight-ahead drive is preferably detected by evaluating driving parameters such as lateral acceleration of the vehicle, longitudinal acceleration of the vehicle, yaw rate, wheel moments, etc. These driving parameters can be measured using sensors or calculated from other variables. Some of these driving parameters can be queried by a vehicle data bus (CAN), where they are also available to other systems such as an anti-lock braking system (ABS) or a traction control (TCS) or an electronic stability program (ESP).
  • ABS anti-lock braking system
  • TCS traction control
  • ESP electronic stability program
  • the wheel acceleration is only evaluated from a minimum vehicle speed.
  • the wheel acceleration is preferably only evaluated if the driving parameters are below certain limit values which describe driving straight ahead.
  • a difference is preferably formed for each vehicle wheel from the minimum and the maximum of the wheel acceleration. It is further preferred that instead of the difference, the amount or only the positive or negative acceleration values of maximum and minimum are formed and evaluated.
  • a reference value is preferably formed from the difference of each individual vehicle wheel, which very particularly preferably represents an arithmetic mean value of the difference over a time T1 or a filtered value of the difference.
  • This filtered value is preferably obtained from first-order filtering.
  • the limit value THRESH 1 is preferably determined as a function of the wheel torque applied to the vehicle wheel. Different limit values THRESH 1 are particularly preferably set for a driven axis and a freely rolling axis.
  • a warning to the vehicle driver is preferably suppressed when a vehicle wheel has exceeded the limit value THRESH 1 and at least one further vehicle wheel has exceeded a second limit value THRESH 2.
  • the method according to the invention is preferably used together with a known indirectly measuring tire pressure monitoring system (DDS) and / or a known directly measuring tire pressure monitoring system (TPMS), this only for supplementary consideration or improvement of known indirectly measuring tire pressure monitoring system (DDS) and / or a known directly measuring Tire pressure monitoring system (TPMS) is used. Further features and advantages of the method according to the invention emerge from the subordinate claims. The invention is described with reference to the three figures. The figures show:
  • Fig. 2 shows the wheel torque over the vehicle speed
  • Fig. 3 shows the Difference Sample_acc over time.
  • curve 1 shows a possible course of the wheel acceleration a Ra d of a vehicle wheel over time t.
  • the wheel acceleration a wheel is observed over time intervals TO and a difference Sample_acc is formed, which consists of the maximum maxi and the minimum mini of each Rades i exists within this time interval TO.
  • a reference value Ref_DIFF for the wheel acceleration a Ra d of each individual wheel i is determined and stored over a time Tl which comprises a plurality of time intervals TO.
  • the wheel torque M of a vehicle wheel is plotted against the vehicle speed v. Since the vehicle speed v is dependent not only on the wheel torque M but also on other parameters such as the coefficient of friction between the road and the tire, so-called wheel torque ranges are formed, as shown by curves 2 and 3. For each vehicle speed v, the wheel torque ranges describe a valid range in which a wheel torque M of an intact vehicle wheel can lie. If a wheel torque M lies at a vehicle speed v outside the valid range, this indicates that there is, for example, a tire defect.
  • Curve 2 describes the valid wheel torque range of a driven vehicle wheel above vehicle speed v
  • curve 3 describes a typical course of the wheel torque range of a rolling or non-driven vehicle wheel of a driven axle above Vehicle speed v represents.
  • This method can be used both for a vehicle with one driven axle and for a vehicle with two driven axles.
  • the wheel torque distribution is calculated depending on the degree of locking. This is either on the vehicle data bus (CAN), or can be calculated from the wheel speed differences z.
  • CAN vehicle data bus
  • the difference Sar ⁇ ple_acc of the wheel acceleration a wheel is plotted against time t in FIG. 3.
  • 3a shows a possible course of a difference Sample_accl of a wheel over time t without exceeding a limit value THRESH 1 or THRESH 2.
  • the difference Sample_acc2 of a wheel represented by curve 5 exceeds the limit values THRESH 1 and THRESH 2.
  • a difference Sample_acc3 of one wheel represented by curve 6 likewise exceeds the limit values THRESH 1 and THRESH 2
  • a difference Sample_acc4 of another wheel, represented by curve 7 only exceeds the limit value THRESH2.
  • a selection of driving maneuvers is defined which allow an evaluation (e.g. all DDS-relevant driving maneuvers such as straight-ahead driving).
  • a straight-ahead drive is recognized by evaluating driving parameters such as lateral acceleration, longitudinal acceleration, yaw rate, wheel moments, etc.
  • driving parameters can be sensed, calculated from other parameters or queried by a vehicle data bus (CAN), where these driving parameters are already made available or used by other systems such as an anti-lock braking system (ABS), a traction control (TCS) or an electronic stability program (ESP) ,
  • ABS anti-lock braking system
  • TCS traction control
  • ESP electronic stability program
  • the limit values THRESH 2 can be set individually or in pairs for each wheel, in each case the driven or the non-driven wheels. Furthermore, separate selection criteria for THRESH1 are set depending on whether a moment is currently applied to this wheel or not.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
  • Measuring Fluid Pressure (AREA)
  • Regulating Braking Force (AREA)

Abstract

The invention relates to a method for indirectly identifying the loss of pressure on a motor vehicle wheel during which the wheel acceleration awheel is evaluated. The invention also relates to a computer program product that defines an algorithm, which contains a method for indirectly identifying the loss of pressure on a motor vehicle wheel.

Description

Verfahren zur indirekten Druckverlusterkennung an einem KraftfahrzeugradMethod for indirect pressure loss detection on a motor vehicle wheel
Die vorliegende Erfindung bezieht sich auf ein Verfahren zur indirekten Druckverlusterkennung an einem Kraftfahrzeugrad, sowie ein Computerprogrammprodukt gemäß Anspruch 10.The present invention relates to a method for indirect pressure loss detection on a motor vehicle wheel, and a computer program product according to claim 10.
Es sind, z. B. aus DE 100 58 140 AI, Verfahren zur indirekten Reifendruckverlusterkennung (DDS) bekannt die auf einer Messung von Abrollradien der Räder eines Fahrzeugs basieren. Aus diesen Messgrößen werden Verhältnisse gebildet. Diese werden gelernt und dienen anschließend als Referenzwerte. Abweichungen davon werden als Reifendruckverlust interpretiert.There are e.g. B. from DE 100 58 140 AI, method for indirect tire pressure loss detection (DDS) known based on a measurement of the rolling radii of the wheels of a vehicle. Relationships are formed from these measured variables. These are learned and then serve as reference values. Deviations from this are interpreted as a loss of tire pressure.
In der DE 100 44 114 AI ist ein weiteres Verfahren und eine Vorrichtung zur Erkennung eines Druckverlustes von Reifen in Kraftfahrzeugen mit Plausibilitätsprüfung beschrieben. Die in dieser Schrift bestimmten Referenzwerte zur Erkennung eines Druckverlustes werden durch die Plausibilitätsprüfung überprüft um Fehlwarnungen zu vermeiden bzw. zu minimieren.DE 100 44 114 AI describes a further method and a device for detecting a loss of pressure in tires in motor vehicles with a plausibility check. The reference values determined in this document for the detection of a pressure loss are checked by the plausibility check in order to avoid or minimize false warnings.
In der WO 2000006433 AI ist ein Verfahren zur Schlechtwegerkennung beschrieben, welches zur Fahrzeuggeschwindigkeitsregelung eingesetzt wird.WO 2000006433 AI describes a method for rough road detection which is used for vehicle speed control.
Ein Nachteil dieser bekannten indirekten Druckverlusterken- nungsverfahren ist, dass diese Verfahren immer auf Abweichungen der einzelnen Räder untereinander aufbauen, wodurch ein Druckverlust an mehr als an einem Reifen nicht immer erkennbar ist. Speziell die Erkennung von Druckverlusten an mehreren bzw. allen Reifen ist damit nicht immer möglich.A disadvantage of these known indirect pressure loss detection methods is that these methods always build on deviations of the individual wheels from one another, so that a pressure loss on more than one tire is not always recognizable. In particular, the detection of pressure losses on several or all tires is not always possible.
Weiterhin sind Verfahren bekannt, welche mit Hilfe einer Frequenzanalyse eine Reifendruckverlusterkennung durchführen. Hierbei wird eine Verschiebung von Maxima im Frequenzspektrum als Reifendruckverlust interpretiert. Dieser Lösungsansatz ist sehr rechenintensiv und benötigt hohe Ressourcen an Arbeitsspeicher (RAM) .Methods are also known which carry out a tire pressure loss detection with the aid of a frequency analysis. A shift in maxima in the frequency spectrum is interpreted as a loss of tire pressure. This approach is very computationally intensive and requires high resources of RAM.
Daher ist es Aufgabe der Erfindung, ein Verfahren bereitzustellen, welches eine kostengünstige und sichere Erkennung von Druckverlusten auch an mehreren bzw. allen Rädern ermöglicht.It is therefore an object of the invention to provide a method which enables cost-effective and reliable detection of pressure losses even on several or all wheels.
Diese Aufgabe wird erfindungsgemäß durch das Verfahren gemäß Anspruch 1 gelöst.This object is achieved by the method according to claim 1.
Bevorzugt wird die Radbeschleunigung innerhalb einer vorbestimmten Zeit für alle vier Räder beobachtet und Abweichungen in der Radbeschleunigung ausgewertet. Die Auswertung der Radbeschleunigung erfolgt hierbei bevorzugt nur, wenn bestimmte Fahrmanöver bzw. Fahrzustände vorliegen. Als ein besonders bevorzugter Fahrzustand wird eine Geradeausfahrt angesehen. Die Erkennung einer Geradeausfahrt erfolgt bevorzugt durch die Auswertung von Fahrparametern wie beispielsweise Querbeschleunigung des Fahrzeugs, Längsbeschleunigung des Fahrzeugs, Gierrate, Radmomente, etc. Diese Fahrparameter können mittels Sensoren gemessen oder aus anderen Größen berechnet werden. Teilweise können diese Fahrparameter von einem Fahrzeugdatenbus (CAN) abgefragt werden, wo sie auch anderen Systemen wie beispielsweise einem Antiblockiersystem (ABS) oder einer Traktionskontrolle (TCS) oder einem elektronischen Stabilitätsprogramm (ESP) zur Verfügung stehen.The wheel acceleration is preferably observed for all four wheels within a predetermined time and deviations in the wheel acceleration are evaluated. The wheel acceleration is preferably only evaluated when certain driving maneuvers or driving conditions are present. Straight-ahead driving is regarded as a particularly preferred driving state. A straight-ahead drive is preferably detected by evaluating driving parameters such as lateral acceleration of the vehicle, longitudinal acceleration of the vehicle, yaw rate, wheel moments, etc. These driving parameters can be measured using sensors or calculated from other variables. Some of these driving parameters can be queried by a vehicle data bus (CAN), where they are also available to other systems such as an anti-lock braking system (ABS) or a traction control (TCS) or an electronic stability program (ESP).
Weiterhin ist bevorzugt, dass die Auswertung der Radbeschleunigung erst ab einer Fahrzeugmindestgeschwindigkeit erfolgt. Vorzugsweise erfolgt die Auswertung der Radbeschleunigung nur, wenn die Fahrparameter unterhalb gewisser Grenzwerte liegen, welche eine Geradeausfahrt beschreiben. Aus dem Minimum und dem Maximum der Radbeschleunigung wird bevorzugt für jedes Fahrzeugrad eine Differenz gebildet. Weiterhin ist bevorzugt, dass anstatt der Differenz der Betrag oder nur die positiven bzw. negativen Beschleunigungswerte von Maximum und Minimum gebildet und ausgewertet werden.It is further preferred that the wheel acceleration is only evaluated from a minimum vehicle speed. The wheel acceleration is preferably only evaluated if the driving parameters are below certain limit values which describe driving straight ahead. A difference is preferably formed for each vehicle wheel from the minimum and the maximum of the wheel acceleration. It is further preferred that instead of the difference, the amount or only the positive or negative acceleration values of maximum and minimum are formed and evaluated.
Vorzugsweise wird aus der Differenz jedes einzelnen Fahrzeugrades ein Referenzwert gebildet, welcher ganz besonders bevorzugt einen arithmetischen Mittelwert der Differenz über eine Zeit Tl oder einen gefilterten Wert der Differenz darstellt. Dieser gefilterte Wert wird bevorzugt aus einer Filterung erster Ordnung gewonnen.A reference value is preferably formed from the difference of each individual vehicle wheel, which very particularly preferably represents an arithmetic mean value of the difference over a time T1 or a filtered value of the difference. This filtered value is preferably obtained from first-order filtering.
Der Grenzwert THRESH 1 wird bevorzugt abhängig vom am Fahrzeugrad anliegenden Radmoment festgelegt. Besonders bevorzugt werden unterschiedliche Grenzwerte THRESH 1 für eine angetriebene Achse und eine freirollende Achse festgelegt.The limit value THRESH 1 is preferably determined as a function of the wheel torque applied to the vehicle wheel. Different limit values THRESH 1 are particularly preferably set for a driven axis and a freely rolling axis.
Eine Warnung an den Fahrzeugführer wird vorzugsweise unterdrückt, wenn ein Fahrzeugrad den Grenzwert THRESH 1 überschritten hat und mindestens ein weiteres Fahrzeugrad einen zweiten Grenzwert THRESH 2 überschritten hat.A warning to the vehicle driver is preferably suppressed when a vehicle wheel has exceeded the limit value THRESH 1 and at least one further vehicle wheel has exceeded a second limit value THRESH 2.
Bevorzugt wird das erfindungsgemäße Verfahren zusammen mit einem bekannten indirekt messenden Reifendrucküberwachungssystem (DDS) und/oder einem bekannten direkt messenden Reifendrucküberwachungssystem (TPMS) eingesetzt, wobei dieses nur zur ergänzenden Betrachtung oder Verbesserung bekannten indirekt messenden Reifendrucküberwachungssystem (DDS) und/oder einem bekannten direkt messenden Reifendrucküberwachungssystem (TPMS) herangezogen wird. Weitere Merkmale und Vorteile des erfindungsgemäßen Verfahrens gehen aus den ünteransprüchen hervor. Die Erfindung wird anhand der dreier Figuren beschrieben. In den Figuren zeigen:The method according to the invention is preferably used together with a known indirectly measuring tire pressure monitoring system (DDS) and / or a known directly measuring tire pressure monitoring system (TPMS), this only for supplementary consideration or improvement of known indirectly measuring tire pressure monitoring system (DDS) and / or a known directly measuring Tire pressure monitoring system (TPMS) is used. Further features and advantages of the method according to the invention emerge from the subordinate claims. The invention is described with reference to the three figures. The figures show:
Fig. 1 die Radbeschleunigung über der Zeit,1 shows the wheel acceleration over time,
Fig. 2 das Radmoment über der FahrZeuggeschwindigkeit undFig. 2 shows the wheel torque over the vehicle speed and
Fig. 3 die Differnz Sample_acc über der Zeit.Fig. 3 shows the Difference Sample_acc over time.
In Fig. 1 stellt Kurve 1 einen möglichen Verlauf der Radbeschleunigung aRad eines Fahrzeugrades über der Zeit t dar. Die Radbeschleunigung aRad wird jeweils über Zeitintervalle TO beobachtet und eine Differenz Sample_acc gebildet, welche aus dem Maximum Maxi und dem Minimum Mini eines jeden Rades i innerhalb dieses Zeitintervalls TO besteht. Über eine Zeit Tl, welche mehrere Zeitintervalle TO umfasst, wird ein Referenzwert Ref_DIFF für die Radbeschleunigung aRad jedes einzelnen Rades i ermittelt und abgelegt.In Fig. 1 curve 1 shows a possible course of the wheel acceleration a Ra d of a vehicle wheel over time t. The wheel acceleration a wheel is observed over time intervals TO and a difference Sample_acc is formed, which consists of the maximum maxi and the minimum mini of each Rades i exists within this time interval TO. A reference value Ref_DIFF for the wheel acceleration a Ra d of each individual wheel i is determined and stored over a time Tl which comprises a plurality of time intervals TO.
In Fig. 2 ist das Radmoment M eines Fahrzeugrades gegen die Fahrzeuggeschwindigkeit v aufgetragen. Da die Fahrzeuggeschwindigkeit v nicht nur von dem Radmoment M, sondern auch von anderen Parametern wie beispielsweise dem Reibwert zwischen Fahrbahn und Reifen abhängig ist, werden sogenannte Radmomentenbe- reiche, wie durch Kurve 2 und 3 dargestellt, gebildet. Die Rad- omentenbereiche beschreiben hierbei zu jeder Fahrzeuggeschwindigkeit v einen gültigen Bereich in dem ein Radmoment M eines intakten Fahrzeugrades liegen kann. Liegt ein Radmoment M bei einer Fahrzeuggeschwindigkeit v außerhalb des gültigen Bereichs, so deutet dies darauf hin, dass beispielsweise ein Reifendefekt vorliegt. Kurve 2 beschreibt hierbei den gültigen Radmomentenbereich eines angetriebenen Fahrzeugrades über der Fahrzeuggeschwindigkeit v, wohingegen Kurve 3 einen typischen Verlauf des Radmomentenbereichs eines freirollenden bzw. nicht- angetriebenen Fahrzeugrades einer angetriebenen Achse über der Fahrzeuggeschwindigkeit v darstellt. Dieses Verfahren lässt sich sowohl für ein Fahrzeug mit einer angetriebenen Achse, als auch für ein Fahrzeug mit zwei angetriebenen Achsen einsetzen. Bei sperrbaren Differentialen wird die Radmomentenverteilung in Abhängigkeit vom Sperrgrad berechnet. Dieser liegt entweder auf dem Fahrzeugdatenbus (CAN) vor, oder kann aus den Raddrehzahldifferenzen z. B. bei Kurvenfahrt durch Vergleich Gierrate/ Querbeschleunigung mit den gemessenen Werten beziehungsweise in Längsrichtung durch Vergleich des Schlupfs an den Vorderrädern im Vergleich mit den Hinterrädern als Funktion des Radmomentes ermittelt werden.2, the wheel torque M of a vehicle wheel is plotted against the vehicle speed v. Since the vehicle speed v is dependent not only on the wheel torque M but also on other parameters such as the coefficient of friction between the road and the tire, so-called wheel torque ranges are formed, as shown by curves 2 and 3. For each vehicle speed v, the wheel torque ranges describe a valid range in which a wheel torque M of an intact vehicle wheel can lie. If a wheel torque M lies at a vehicle speed v outside the valid range, this indicates that there is, for example, a tire defect. Curve 2 describes the valid wheel torque range of a driven vehicle wheel above vehicle speed v, whereas curve 3 describes a typical course of the wheel torque range of a rolling or non-driven vehicle wheel of a driven axle above Vehicle speed v represents. This method can be used both for a vehicle with one driven axle and for a vehicle with two driven axles. With lockable differentials, the wheel torque distribution is calculated depending on the degree of locking. This is either on the vehicle data bus (CAN), or can be calculated from the wheel speed differences z. B. when cornering by comparing yaw rate / lateral acceleration with the measured values or in the longitudinal direction by comparing the slip on the front wheels in comparison with the rear wheels as a function of the wheel torque.
Die Differenz Sarαple_acc der Radbeschleunigung aRad ist in Fig. 3 gegen die Zeit t aufgetragen. Fig. 3a stellt durch Kurve 4 einen möglichen Verlauf einer Differenz Sample_accl eines Rades über der Zeit t ohne Überschreitung eines Grenzwertes THRESH 1 oder THRESH 2 dar. In Fig. 3b übersteigt die durch Kurve 5 dargestellte Differenz Sample_acc2 eines Rades die Grenzwerte THRESH 1 und THRESH 2. In Fig. 3c übersteigt ebenfalls eine durch Kurve 6 dargestellte Differenz Sample_acc3 eines Rades die Grenzwerte THRESH 1 und THRESH 2, wohingegen eine Differenz Sample_acc4 eines anderen Rades, dargestellt durch Kurve 7, nur den Grenzwert THRESH2 übersteigt.The difference Sarαple_acc of the wheel acceleration a wheel is plotted against time t in FIG. 3. 3a shows a possible course of a difference Sample_accl of a wheel over time t without exceeding a limit value THRESH 1 or THRESH 2. By means of curve 4, the difference Sample_acc2 of a wheel represented by curve 5 exceeds the limit values THRESH 1 and THRESH 2. In FIG. 3c, a difference Sample_acc3 of one wheel represented by curve 6 likewise exceeds the limit values THRESH 1 and THRESH 2, whereas a difference Sample_acc4 of another wheel, represented by curve 7, only exceeds the limit value THRESH2.
Im folgenden wird ein Beispiel für das erfindungsgemäße Verfahren anhand einzelner Schritte unter Bezugnahme auf die Figuren 1 bis 3 beschrieben.An example of the method according to the invention is described below using individual steps with reference to FIGS. 1 to 3.
1) Es wird eine Auswahl von Fahrmanöver definiert, welche eine Auswertung zulassen (z. B. alle DDS-relevanten Fahrmanöver wie beispielsweise eine Geradeausfahrt) . Die Erkennung einer Geradeausfahrt erfolgt durch Auswertung von Fahrparameter wie beispielsweise Querbeschleunigung, Längsbeschleunigung, Gierrate, Radmomente, etc. Diese Fahrparameter können sensorisch erfasst, aus anderen Größen berechnet oder von einem Fahrzeugdatenbus (CAN) abgefragt werden, wo diese Fahrparameter bereits von anderen System wie einem Antiblockiersystem (ABS) , einer Traktionskontrolle (TCS) oder einem elektronischen Stabilitätsprogramm (ESP) bereitgestellt oder ebenfalls genutzt werden. Die Auswertung der Radbeschleunigung aRad erfolgt erst ab einer Fahrzeugmindestgeschwindigkeit von etwa 15 km/h.1) A selection of driving maneuvers is defined which allow an evaluation (e.g. all DDS-relevant driving maneuvers such as straight-ahead driving). A straight-ahead drive is recognized by evaluating driving parameters such as lateral acceleration, longitudinal acceleration, yaw rate, wheel moments, etc. These Driving parameters can be sensed, calculated from other parameters or queried by a vehicle data bus (CAN), where these driving parameters are already made available or used by other systems such as an anti-lock braking system (ABS), a traction control (TCS) or an electronic stability program (ESP) , The wheel acceleration a wheel is only evaluated from a minimum vehicle speed of approximately 15 km / h.
2) über ein Zeitintervall TO wird das Maximum MAXi und das Minimum MINi der Radbeschleunigung aRad (Siehe Fig. 1) eines Rades i ermittelt. Dies erfolgt für alle n Räder des Fahrzeugs2) The maximum MAXi and the minimum MINi of the wheel acceleration a wheel (see FIG. 1) of a wheel i are determined over a time interval TO. This is done for all n wheels of the vehicle
3) Es wird die Differenz, oder der Betrag oder nur die positiven bzw. negativen Beschleunigungswerte von Maximum und Minimum gebildet und ausgewertet:3) The difference, or the amount or only the positive or negative acceleration values of maximum and minimum are formed and evaluated:
4) Sample_acc = MAX—MINi4) Sample_acc = MAX — MINi
5) Es wird diese Differenz Sample_acc über eine Zeit Tl, welche sich über mehrere Zeitintervalle TO erstreckt, beobachtet und ein Referenzwert Ref_DIFF hierfür abgelegt. Das kann der arithmetische Mittelwert oder ein gefilterter Wert, z. B. durch einen Filter erster Ordnung, sein.5) This difference Sample_acc is observed over a time T1, which extends over several time intervals TO, and a reference value Ref_DIFF is stored for this. This can be the arithmetic mean or a filtered value, e.g. B. through a first order filter.
6) Es wird die Differenz Sample_acc (siehe Fig. 3) weiter beobachtet und bei Überschreiten eines radmomentenabhän- gigen Grenzwertes THRESH1 wird erst nach statistischen Absicherung, dies kann z. B. eine hinreichend kleine Standardabweichung sein, eine Warnung ausgegeben. 7) Es finden Plausibilisierungen statt, so dass Warnungen unterdrückt werden, falls andere Mechanismen beispielsweise einen Schlechtweg erkannt haben oder alle 4 Räder einen Grenzwert THRESH2 (siehe Fig. 3) , welcher kleiner als der radmomentenabhängige Grenzwert THRESH 1 ist, überschreiten .6) The difference Sample_acc (see FIG. 3) is observed further and if a wheel torque-dependent limit value THRESH1 is exceeded, this is only after statistical validation. B. be a sufficiently small standard deviation, issued a warning. 7) There are plausibility checks so that warnings are suppressed if other mechanisms have detected a bad road, for example, or all 4 wheels exceed a limit value THRESH2 (see FIG. 3), which is smaller than the wheel torque-dependent limit value THRESH 1.
8) Zudem können in einer weiteren Ausprägung der Erfindung die Grenzwerte THRESH 2 für jedes Rad individuell oder paarweise, jeweils die angetriebenen bzw. die nichtange- triebenen Räder, gesetzt werden. Weiterhin werden getrennte Auswahlkriterien für THRESH1 gesetzt in Abhängigkeit davon, ob gerade ein Moment an diesem Rad anliegt oder nicht.8) In addition, in a further embodiment of the invention, the limit values THRESH 2 can be set individually or in pairs for each wheel, in each case the driven or the non-driven wheels. Furthermore, separate selection criteria for THRESH1 are set depending on whether a moment is currently applied to this wheel or not.
Es werden alle oder Teile von Unterdrückungsmechanismen verwendet, welche bereits aus anderen Systemen vorliegen (z. B. eines indirekten Reifendruckverlusterkennungssystems, ABS, TCS, ESP, usw. ) All or parts of suppression mechanisms that are already available from other systems are used (e.g. an indirect tire pressure loss detection system, ABS, TCS, ESP, etc.)

Claims

Patentansprüche: claims:
1. Verfahren zur indirekten Druckverlusterkennung an einem Kraftfahrzeugrad, dadurch gekennzeichnet, dass die zum Ermitteln des Druckverlustes verwendete/n Kenngröße/n im wesentlichen aus der Radbeschleunigung aRad abgeleitet wird/werden.1. A method for indirect pressure loss detection on a motor vehicle wheel , characterized in that the characteristic variable (s) used to determine the pressure loss is / are essentially derived from the wheel acceleration a wheel .
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine Auswertung der Radbeschleunigung aRad nur bei bestimmten Fahrmanövern bzw. Fahrzuständen, insbesondere bei einer Geradeausfahrt, durchgeführt wird.2. The method according to claim 1, characterized in that an evaluation of the wheel acceleration a wheel is carried out only in certain driving maneuvers or driving conditions, in particular when driving straight ahead.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass über ein vorbestimmtes Zeitintervall TO das Minimum Mini und das Maximum Maxi der Radbeschleunigung aRad jedes einzelnen Fahrzeugrades ermittelt wird.3. The method according to claim 2, characterized in that the minimum mini and the maximum maxi of the wheel acceleration a wheel of each individual vehicle wheel is determined over a predetermined time interval TO.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass aus dem Minimum Mini und dem Maximum Maxi der Radbeschleunigung aRad eine Differenz Sample_acc gebildet wird.4. The method according to claim 3, characterized in that a difference Sample_acc is formed from the minimum mini and the maximum maxi of the wheel acceleration a wheel .
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass ein Referenzwert Ref_DIFF über eine Zeit Tl, welche sich über mehrere Zeitintervalle TO erstreckt, aus den Differenzen Sample_acc der einzelnen Zeitintervalle TO gebildet wird.5. The method according to claim 4, characterized in that a reference value Ref_DIFF over a time T1, which extends over several time intervals TO, is formed from the differences Sample_acc of the individual time intervals TO.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass bei Überschreitung eines ersten Grenzwertes THRESH 1 durch die Differenz Sample_acc eine Warnung ausgegeben wird.6. The method according to claim 5, characterized in that a warning is output when a first limit value THRESH 1 is exceeded by the difference Sample_acc.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die Warnung unterdrückt wird, wenn mindestens eine weitere Dif- ferenz Sample_acc eines weiteren Fahrzeugrades einen zweiten Grenzwert THRESH 2 überschritten hat.7. The method according to claim 6, characterized in that the warning is suppressed if at least one further dif- ference Sample_acc of another vehicle wheel has exceeded a second limit value THRESH 2.
8. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die Warnung unterdrückt wird, wenn andere im Fahrzeug vorhandene Mechanismen bzw. Verfahren eine Situation, z. B. Schlechtweg, uneinheitlicher Fahrbahnreibwert („μ-Split"), Fahrt auf Schnee und Eis, erkannt haben, welche die Auswertung der Radbeschleunigung beeinflusst.8. The method according to claim 6, characterized in that the warning is suppressed when other mechanisms or methods in the vehicle present a situation, eg. B. Bad road, inconsistent road friction ("μ-split"), driving on snow and ice, have recognized which influences the evaluation of the wheel acceleration.
9. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Auswertung der Radbeschleunigung aRad unterdrückt wird, wenn andere die Radbeschleunigung aRad beeinflussende Systeme, wie z. B. Antiblockiersystem, Traktionskontrollsystem, elektronisches Stabilitätssystem, etc., aktiv sind.9. The method according to claim 1, characterized in that the evaluation of the wheel acceleration a wheel is suppressed when other systems influencing the wheel acceleration a wheel , such as. B. anti-lock braking system, traction control system, electronic stability system, etc., are active.
10. Computerprogrammprodukt, dadurch gekennzeichnet, dass dieses einen Algorithmus definiert, welcher ein Verfahren gemäß mindestens einem der Ansprüche 1 bis 9 umfasst. 10. Computer program product, characterized in that it defines an algorithm which comprises a method according to at least one of claims 1 to 9.
EP03789198A 2002-12-17 2003-12-10 Method for indirectly identifying the loss of pressure on a motor vehicle wheel Expired - Lifetime EP1575790B1 (en)

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DE10259201 2002-12-17
DE10259201 2002-12-17
PCT/EP2003/013987 WO2004054824A1 (en) 2002-12-17 2003-12-10 Method for indirectly identifying the loss of pressure on a motor vehicle wheel

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US20060220811A1 (en) 2006-10-05

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